The second man arrested yesterday in connection to the Brussels terror attacks reportedly sneaked back into Europe with a fake passport after posting Facebook photos of himself with ISIS in Syria.

Osama Krayem, a Swedish national, was reportedly one of the five men arrested in police raids yesterday including Mohammed Abrini, who has now been charged with 'terrorist murders'.

Krayem, 23, is thought to have joined ISIS in 2014 before using a false passport under the name Naim al-Hamed to illegally travel along the migrant route from Turkey to Greece and on to Belgium.

Police have also made a sixth arrest today in connection to the terror attacks in Brussels last month. Bilal El Makhoukh, who was a member of Shariah4Belgium and was

Osama Krayem, a Swedish-born man was reportedly one of the five men arrested in police raids yesterday on suspicion of being involved in the terror attacks in Brussels last month

Krayem (left) is thought to have been one of the five men arrested, including Mohammed Abrini (right). Krayem used the false name Naim al-Hamed

Police have yet to confirm if Krayem was the second man arrested alongside Mohammed Abrini, who is thought to be the 'man in the hat' on CCTV at the airport attack.

'We are investigating if Abrini can be positively identified as the third person present during the attacks in Brussels National Airport, the so called 'man in the hat,'' said prosecutor Eric Van der Sypt.

Krayem grew up in Malmo and is of Syrian heritage. A relative in Sweden confirmed that they had been spoken to by police but provided no other details.

The 23-year-old posted a photo of himself on Facebook, dressed in military fatigues, standing in front of an flag of tawheed and holding an AK-47 in January 2015.

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He is believed to be the man seen on CCTV at the City 2 shopping centre, where the rucksacks were bought and later used for the terror attacks.

He is also thought to have been the second man alongside metro bomber Khalid El Bakraoui at the Pétillon metro station.

Serious questions are now being asked how the intelligence services were unable to stop Krayem from travelling back to Europe.

Using the migrant route, Krayem, alongside a second man, who used the name 'Monir Ahmed Alaaj', crossed from Turkey to the Greek island of Leros in September 2015.

From Greece, the pair travelled across to Austria before reaching a refugee camp in Ulm, Germany.

On October 3, Salah Abdeslam picked up the pair from near the Ibis hotel and took them to Brussels.

Video footage has emerged showing a man pinned down on a sidewalk by several armed plain-clothed police

Abrini has been on Europe's most wanted list since being identified on CCTV in a car with Salah Abdeslam

He walked further on the Chaussée de Louvain where he was again filmed at 9.49am talking his mobile phone

Belgian prosecutors released a series of videos, pictures and graphics after painstakingly piecing together the movements of the world's most wanted man

Krayem's fingerprints were believed to have been found at the property used by the Brussels bombers, the morning before the attacks.

15 kg of explosives were discovered inside the property during the subsequent raid.

The arrests came a day after police issued new images of
'the man in the hat' seen on airport cameras walking through the
terminal with Brahim El Bakraoui and Najim Laachraoui.

These two would detonate the heavy bags they were pushing on
trolleys but the third abandoned his bomb and was tracked
walking for miles on CCTV back from the airport into the city,
all the while his face hidden by glasses and a floppy hat.

Police have also been hunting a man seen with El Bakraoui's
younger brother Khalid at a Brussels metro stop shortly before
the latter blew himself up on a train at Maelbeek station.

The man is suspected of being Krayem, according to local media reports.

Mohammed Abrini is rumoured to be the 'man in white' who was spotted at the airport. Local media said he spent time in Syria
last summer but it remains unclear.

Police added Abrini to the wanted list after he was identified from security camera
footage at a motorway service station driving with Abdeslam
toward Paris from Belgium two days before the 13 November attacks in Paris.

Prosecutors have released new CCTV footage showing the 'Man in White' leaving the airport on foot, walking to the nearby town of Zaventem and then into Brussels, where all traces of him were reportedly lost

Belgian federal prosecutors confirmed on Friday they have arrested Abrini along with four other people

Abrini was arrested at the Petillon Metro station in the Anderlecht district, near the Free University of Brussels

The car they were in was later used in the attacks, in which
Abdeslam's elder brother was a suicide bomber. Prosecutors also
said Abrini and Abdeslam rented an apartment that was used by
several of the militants before they struck in Paris.

Abrini, nicknamed 'Brioche' for his work in a bakery, was a
regular at a Molenbeek bar run by the Abdeslam brothers and
which police shut down last September after complaints of drug
deals.

Abrini's fingerprints and DNA were found in two Brussels
apartments, including the one from where three men, including
the two bombers, took a taxi to the airport on March 22. It was
later found to have been used as a bomb-making factory.

One of Krayem's relatives confirmed that they had been contacted by police but did not provide any more details, according to Expressen.

Krayem may have been linekd to Mohamed Belkaid, who was shot dead in an apartment in Forest.

Belkaid, who was married and lived in Sweden, was found next to a flag of tawheed and and a machinegun.

Abrini has been on Europe's most wanted list since being identified on CCTV video (above) in a car with Salah Abdeslam, the recently arrested prime surviving suspect, two days before the Paris atrocities

Abrini was a childhood friend of Abdeslam, another Paris attacker caught by anti-terror police (right) last month in Brussels and currently awaiting extradition to France